Molecular oxygen (O2 ) in Earth's early atmosphere probably originated from the splitting of water vapor (H2O) into hydrogen and oxygen
Indicate whether the statement is true or false
True
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The focal point of the earliest Russian culture was centered around Slavic principalities in the area of which two modern cities?
A. Moscow and St. Petersburg B. Vladivostok and Irkutsk C. Novgorod and Kiev D. Stalingrad and Leningrad
Prior to the Cambrian, organisms used only silica to build rigid skeletons. Indicate whether the statement is true or false
What do the GDP and the World Bank both fail to include in their measures of wealth?
A) The importance of law and order in a society B) The gradual deterioration of machinery used in industrial manufacturing C) The income from the sales of goods abroad D) Natural services provided by ecosystems
USGS Topographic maps reveal details
A) of an area's physical landscape. B) of an area's cultural landscape. C) of an area's elevation variation. D) of both physical features and cultural landmarks of an area. E) of an area's water resources.